Below is a list of unnamed planets from many Star Trek episodes and films, and the names which they have been given in various Star Trek books, comics, and reference works. This project was started on the TrekBBS
Literature Forum, and was really expanded by user Extrocomp. I post it
here on his behalf. I hope to find time sometime to insert the pictures
instead of only links. Email me any additions you know of to make this
list more complete.

Beta
III (The
Return Of The Archons)6-11
VI (The Federation - FASA)Beta
3000 (The Return Of The Archons novelization)Landru
(The Worlds Of The Federation)UFC
611-Beta III (The Worlds Of The
Federation)

It’s
not clear why FASA’s The Federation
sourcebook lists Beta III as the sixth planet in its system.

Betazed
(Ménage à Troi)Beta
II (Star Trek The Next Generation First
Year Sourcebook)Beta
Veldonna V (The Worlds Of The
Federation)Betazed
II (Planets Of The UFP)Beta
Zeta V (Star Trek Star Charts)Cyndriel
(The Worlds Of The
Federation)

Decipher’s
Worlds
sourcebook describes Betazed as the third planet in its system, even
though the Aliens
sourcebook said it was the second planet.

Bynaus
(11001001)101100010100110
(The Worlds Of The Federation)Beta
Nirobi III (Star Trek The Next
Generation First Year Sourcebook)Binar
(Star Trek The Next Generation First
Year Sourcebook)Sigma
Regonis IV (The Worlds Of The
Federation)

According
to the episode 11001001,
Bynaus is located in the Beta Magellan system.

Star
Trek Encyclopedia, The
Way Of D’Era and Worlds
interpret Romii as an alternate name for Remus.Captain’s
Blood claims that Romii is the name of
the system that includes both Romulus and Remus.Star
Trek Maps claims that Romii is a star
system that contains an early Romulan colony.

Rigel
V (Journey
To Babel - mentioned)Beta
Rigel V (Star Trek Star Charts)V’geln
(The Orions: The Book Of Common
Knowledge)

Rigel
VII (The
Menagerie, Part II)Aulia
(The Orions: The Book Of Common
Knowledge)Beta
Orionis A VII (Star Trek Star
Charts)Kolar
(Worlds - Decipher RPG)Orion
(Star Trek The Next Generation: Core
Game Book)

Rigel
VII’s moon (The
Menagerie, Part II)Golia
(The Orions: The Book Of Common
Knowledge)Haladar
(Worlds - Decipher RPG)

Vulcan
(Amok
Time)40
Eridani A (Star Fleet Medical Reference
Manual)40
Eridani I (Star Trek Maps)40
Eridani II (Planets Of The UFP)40
Eridani III (The Federation -
FASA)Minshara
(The Tears Of Eridanus)Ti-Valka’ain
(The Way Of Kolinahr: The
Vulcans)T’Khasi
(The Worlds Of The Federation)UGC
26A-2B (The Tears Of Eridanus)Vulcana
(Federation: The First 150
Years)Vulcanis
(Ishmael)Vulcanis
II (The Way Of Kolinahr: The
Vulcans)